Class 4 Science - Food Our Basic Need - CBSE Worksheets Solutions - 1

Q1: Multiple Choice Questions (MCQs).

(i) Which of these are energy-giving nutrients?

(a) Vitamins and minerals
(b) Carbohydrates and fats
(c) Proteins and fats
(d) Vitamins and carbohydrates
Ans: (b)
The nutrients that provide energy are commonly referred to as macronutrients (carbohydrates, lipids, and proteins). Carbohydrates and proteins provide a similar amount of energy per gram of food.

(ii) Which of these nutrients is very important but required only in very small quantities?
(a) Proteins
(b) Carbohydrates
(c) Water
(d) Fats
Ans: (d)
Fats are required in small quantities by our bodies.

(iii) Which of the following is not good for our body?
(a) Junk food
(b) Carbohydrates
(c) Proteins
(d) Balanced diet
Ans: (a)
Junk food is not good for our body as it is unhealthy.

(iv) Which nutrient helps your body make new cells for growth?
(a) Proteins
(b) Carbohydrates
(c) Vitamins
(d) Fats
Ans: (a)
Proteins give your body amino acids — the building blocks that help your body's cells do all of their everyday activities. Proteins help your body build new cells, repair old cells, create hormones and enzymes, and keep your immune system healthy.

(v) Which of these are known as protective foods?
(a) Vitamins
(b) Carbohydrates
(c) Proteins
(d) Fats
Ans: (a)
Foods that are rich in minerals and vitamins are referred to as protective foods. Foods such as leafy or yellow vegetables, meat, citrus fruits, egg, milk, which contain sufficient quantities of vitamins, minerals and high-quality proteins that protect against the occurrence of a disease of deficiency.

(vi) Which of the following in a way to preserve food?
(a) Canning
(b) Frying
(c) Pickling
(d) Baking
Ans: (a)
Among the oldest methods of preservation are drying, refrigeration, and fermentation. Modern methods include canning, pasteurization, freezing, irradiation, and the addition of chemicals. Advances in packaging materials have played an important role in modern food preservation.

Q2: True or False.

(i) The fibre or roughage in our diet is not digested and does not provide nourishment.
Ans: True
It is sometimes called roughage or bulk. Fiber is the part of plant foods that our bodies do not break down during digestion. Because fiber isn't digested, it doesn't give us calories. Foods that contain a lot of fiber may also contain other types of carbohydrates like starch or sugar.

(ii) Water is essential for all bodily functions and for life.
Ans: True
Here are just a few important ways water works in your body: Regulates body temperature. Moistens tissues in the eyes, nose and mouth. Protects body organs and tissues. Carries nutrients and oxygen to cells.

(iii) Vitamin D is essential to build strong bones and teeth.
Ans: True
Vitamin D is necessary for strong bones and muscles. Without Vitamin D, our bodies cannot effectively absorb calcium, which is essential to good bone health. Children who lack Vitamin D develop the condition called rickets, which causes bone weakness, bowed legs, and other skeletal deformities, such as stooped posture.

(iv) Water also helps in digestion, and the elimination of waste.
Ans: True
Breaking down food – and our metabolism in general – generates waste. This needs to be removed or it would damage the body. Water is the solvent for these waste products – it dissolves them and allows them to pass out of the body as urine, as well as in sweat.

(v) Food in submerged in oil in boiling.
Ans: False
Food is submerged in boiling water.

Q3: Fill in the blanks.

(i) The food that keeps the body warm ______
Ans: Fats also provide energy for the body. They act as reserve of energy when carbohydrates are not available. It helps to keep body warm. Food rich in fats include oil, butter, nuts, coconut, ghee, cheese, cream etc.

(ii) This makes up more than half of our body weight ______
Ans: Water makes up more than half of your body weight.

(iii) Component of food that helps to get rid of undigested food ______
Ans: Dietary fibres are also known as roughage, and roughage is mainly provided by plant products. It does not provide nutrients, but it is an essential component of our food and adds to its bulk. It also helps our body get rid of undigested food.

(iv) Food adversely affects kidney, liver and other vital organs. ______
Ans: A kidney-friendly diet limits those foods that contain large amounts of saturated fat, protein and certain minerals, including sodium, potassium and phosphorus.

(v) Diet that has all the necessary nutrients ______
Ans: A balanced diet is a diet that contains differing kinds of foods in certain quantities and proportions so that the requirement for calories, proteins, minerals, vitamins and alternative nutrients is adequate and a small provision is reserved for additional nutrients to endure the short length of leanness.

Q4: Match the following.

Ans: (a) Food -  source of energy
(b) Pickling - Salt, vinegar
(c) Baking - Cake in oven
(d) Roughage - supports digestive system
(e) Proteins - Body building food

Q5: Which nutrient am I?

(i) I help you to grow and repair damaged parts of your body.
Ans: Proteins
Protein is the major structural component of cells and is responsible for the building and repair of body tissues. Protein is broken down into amino acids, which are building blocks of protein.

(ii) I keep you warm.
Ans: Fats
Fats also provide energy for the body. They act as reserve of energy when carbohydrates are not available. It helps to keep body warm. Food rich in fats include oil, butter, nuts, coconut, ghee, cheese, cream etc.

(iii) I help in the smooth excretion of waste from the body.
Ans: Fibre
Since we do not digest it, the fiber in food passes into the intestine and absorbs water. The undigested fiber creates "bulk" so the muscles in the intestine can push waste out of the body.

(iv) If you need quick energy, I am the one you need.
Ans: Carbohydrates
Complex carbohydrates, such as whole grains, are a great source of sustained energy.

(v) My name starts with V and cure some diseases.
Ans: Vitamins
Vitamins help in curing some diseases.

(vi) I am not a nutrient but I make up more than half of your body weight.
Ans: Water
Water makes up more than half of your body weight.

Q6: Answer the following questions in brief.

(i) Why do we need food?
Ans: Food is essential for our body to develop, replace and repair itself. Food provides us energy to work and play. It protects us from diseases and help to recover fast from illness.

(ii) How does it help to include sufficient roughage in the diet?
Ans: Roughage has numerous health benefits. It helps improve digestion and promotes gut health. It may also improve certain risk factors for heart disease and help you manage your weight and blood sugar.

(iii) How is freezing different than the drying in preserving food?
Ans: Freezing delays spoilage and keeps foods safe by preventing microorganisms from growing and by slowing down the enzyme activity that causes food to spoil. As the water in the food freezes into ice crystals, it becomes unavailable to those microorganisms that need it for growth.

(iv) What is the difference between energy provided by carbohydrates and fats?
Ans: The body uses three main nutrients to function— carbohydrate, protein, and fat. These nutrients are digested into simpler compounds. Carbohydrates are used for energy (glucose). Fats are used for energy after they are broken into fatty acids.

(v) What makes a balanced diet?
Ans: A balanced diet is made up of foods from the five food groups: starchy carbohydrates, fruits and vegetables, protein, dairy and healthy fats. Each provides the range of vitamins and minerals our bodies need to function efficiently.

Q7: Answer the following questions in detail.

(i) What are the precautions we should take while cooking food?
Ans: We must take certain precautions while cooking food because it may get bacteria. The way we cook our food is as important as the way we prepare and store it. Cross contamination from raw to cooked foods, such as from hands or utensils, can also cause food poisoning.

(ii) What are the different nutrients we get from food? Mention their functions and sources.
Ans: Nutrients are the substances found in food which drive biological activity, and are essential for the human body. They are categorized as proteins, fats, carbohydrates (sugars, dietary fiber), vitamins, and minerals, and perform the following vital functions.

• Building all parts of the body such as muscle, bone, teeth, and blood
• Producing energy (power and heat
• Keeping the body in good working order